\begin{table}[htbp]\centering
\def\sym#1{\ifmmode^{#1}\else\(^{#1}\)\fi}
\caption{Probability of Having Any School-Aged Children On Treatment Assignment\label{sacreg}}
\begin{tabular}{l*{2}{c}}
\toprule
                    &\multicolumn{1}{c}{(1)}&\multicolumn{1}{c}{(2)}\\
                    &\multicolumn{1}{c}{Any SAC}&\multicolumn{1}{c}{Any SAC}\\
\midrule
anytreat            &       0.001         &                     \\
                    &     (0.018)         &                     \\
secured             &                     &       0.003         \\
                    &                     &     (0.023)         \\
surprise            &                     &       0.006         \\
                    &                     &     (0.021)         \\
unsecured           &                     &      -0.005         \\
                    &                     &     (0.021)         \\
Constant            &       0.893\sym{***}&       0.893\sym{***}\\
                    &     (0.017)         &     (0.017)         \\
\midrule
Observations        &        1883         &        1883         \\
\bottomrule
\end{tabular}
\end{table}
